The great thing about the Catholic church, is that the Pope doesnt stick around for very long. The Cardinals elect someone that is going to either get fired or promoted (depends how you see it) by virtue of his age.
Would this make the banks more responsible? If you elected a chairman/CEO of advanced years, would they not be more interested in building a lasting legacy, rather than trying to grab a quick buck for the future?
If I only had 5 years left, I'd be less inclined to plunder the coffers and fix interest rates :>